Where did SIGABRT come from?

SIGABRT is an error message frequently encountered during iOS development. What does this information mean? Where is the definition? Is it caused by a shrimp problem? How can this problem be solved? This article attempts to give answers to these questions.

# Define sighup 1
/* Hangup */

# Define SIGINT 2
/* Interrupt */

# Define sigquit 3
/* Quit */

# Define sigill 4
/* Illegal instruction (not reset when caught )*/

# Define sigtrap 5
/* Trace trap (not reset when caught )*/

# Define SIGABRT 6
/* Abort ()*/

# If (defined (_ posix_c_source )&&! Defined (_ darwin_c_source ))

# Define sigpoll 7
/* Pollable event ([XSR] generated, not supported )*/

# Else /*(! _ Posix_c_source | _ darwin_c_source )*/

# Define sigiot SIGABRT/* compatibility */

# Define sigemt 7
/* EMT instruction */

# Endif /*(! _ Posix_c_source | _ darwin_c_source )*/

# Define sigfpe 8
/* Floating point exception */

# Define sigkill 9
/* Kill (cannot be caught or ignored )*/

# Define sigbus 10
/* Bus Error */

# Define SIGSEGV 11
/* Segmentation violation */

# Define sigsys 12
/* Bad argument to system call */

# Define sigpipe 13
/* Write on a pipe with no one to read it */

# Define sigalrm 14
/* Alarm clock */

# Define sigterm 15
/* Software termination signal from kill */

# Define sigurg 16
/* Urgent condition on Io channel */

# Define sigstop 17
/* Sendable stop signal not from tty */

# Define sigtstp 18
/* Stop signal from tty */

# Define sigcont 19
/* Continue a stopped process */

# Define sigchld 20
/* To parent on child stop or exit */

# Define sigttin 21
/* To readers pgrp upon background tty read */

# Define sigttou 22
/* Like ttin for output if (TP-> t_local & ltostop )*/

# If (! Defined (_ posix_c_source) | defined (_ darwin_c_source ))

# Define sigio 23
/* Input/output possible signal */

# Endif

# Define sigxcpu 24
/* Exceeded CPU time limit */

# Define sigxfsz 25
/* Exceeded file size limit */

# Define sigvtalrm 26
/* Virtual time alarm */

# Define sigprof 27
/* Profiling time alarm */

# If (! Defined (_ posix_c_source) | defined (_ darwin_c_source ))

# Define sigwinch 28
/* Window size changes */

# Define siginfo 29
/* Information Request */

# Endif

# Define SIGUSR1 30
/* User defined signal 1 */

# Define sigusr2 31
/* User defined Signal 2 */