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syserrlst(3) [bsd man page]

SYSERRLST(3)						     Library Functions Manual						      SYSERRLST(3)

NAME
syserrlst, __errlst - read system error messages from file SYNOPSIS
char * syserrlst(err) int err; char * __errlst(err, path); int err; char *path; DESCRIPTION
Syserrlst(3) reads the error message string corresponding to err from the file /etc/syserrlst. __errlst(3) reads the error message string corresponding to err from the file path. The file path must be in the format described in syserrlst(5). NULL is returned if err is out of bounds (negative or greater than the highest message number in /etc/syserrlst or path) or if the error message file can not be opened. It is the responsibility of the caller (strerror(3)) to check for and properly handle the NULL return. RETURN VALUE
NULL if an error was encountered in opening the error message file, if the error was out of bounds, or if the file did not start with the correct magic number. Otherwise a char * is returned pointing to a static buffer containing the text of the error message. ERRORS
syserrlst(3) and __errlst(3) can return any of the errors for the open(2), lseek(2), or read(2) system calls. SEE ALSO
perror(3), strerror(3), syserrlst(5) HISTORY
syserrlst(3), and __errlst(3) were created for 2.11BSD with the aim of saving 2kb of Data space in programs which called perror(3), or str- error(3). BUGS
The information is stored in a static buffer. 3rd Berkeley Distribution March 26, 1996 SYSERRLST(3)

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ERR(3)							   BSD Library Functions Manual 						    ERR(3)

NAME
err, verr, errx, verrx, warn, vwarn, warnx, vwarnx, -- formatted error messages SYNOPSIS
#include <err.h> void err(int eval, const char *fmt, ...); void errx(int eval, const char *fmt, ...); void warn(const char *fmt, ...); void warnx(const char *fmt, ...); #include <stdarg.h> void verr(int eval, const char *fmt, va_list args); void verrx(int eval, const char *fmt, va_list args); void vwarn(const char *fmt, va_list args); void vwarnx(const char *fmt, va_list args); DESCRIPTION
The err() and warn() family of functions display a formatted error message on the standard error output. In all cases, the last component of the program name, a colon character, and a space are output. If the fmt argument is not NULL, the printf(3) -like formatted error message is output. The output is terminated by a newline character. The err(), verr(), warn(), and vwarn() functions append an error message obtained from strerror(3) based on a code or the global variable errno, preceded by another colon and space unless the fmt argument is NULL. The err(), verr(), warn(), and vwarn() functions use the global variable errno to look up the error message. The errx() and warnx() functions do not append an error message. The err(), verr(), errx(), and verrx() functions do not return, but exit with the value of the argument eval. EXAMPLES
Display the current errno information string and exit: if ((p = malloc(size)) == NULL) err(1, NULL); if ((fd = open(file_name, O_RDONLY, 0)) == -1) err(1, "%s", file_name); Display an error message and exit: if (tm.tm_hour < START_TIME) errx(1, "too early, wait until %s", start_time_string); Warn of an error: if ((fd = open(raw_device, O_RDONLY, 0)) == -1) warnx("%s: %s: trying the block device", raw_device, strerror(errno)); if ((fd = open(block_device, O_RDONLY, 0)) == -1) err(1, "%s", block_device); SEE ALSO
exit(3), printf(3), perror(3), strerror(3) HISTORY
The err() and warn() functions first appeared in 4.4BSD. BSD
March 6, 1999 BSD

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